Stroller frame



FIG. 1 is a perspective view, taken from the front, right side, of the stroller frame according to my design, showing the seat location in dotted-line format;

FIG. 2 is a perspective view, taken from the front, right side, of the stroller frame according to my design, excluding an indication of the seat location;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a right side view thereof.

The broken lines for the seat location in FIG. 1 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a stroller frame, as shown and described. 